mineralogy. 
log 
blended with the * calcareous earth, with 
which they melt to a corroding glafs, which 
diflblves the ftrongeft crucibles, unlefs 
fome quartz or apyrus clay is added 
thereto. 
5. When heated flowly, and by degrees, they 
- give a phofphorefcent light ; but as foo4 
as they are made red-hot, they lofe this 
quality. The coloured ones, and eipe- 
ciallythe green, give the ftrongeft light, 
but none of them any longer than whilft 
they are well warm. 
6. They melt and diffolve very eafily by the 
addition of borax, and next to that by the 
, microcofmic fait, without ebullition. 
pECT. xcvin; 
J, Indurated Fluor, Fluor mineralis indu* 
ratus, 
I. Solid, of an indeterminate figure, Fluor 
farticuTis impalpahilibus^ figurd indetermi^ 
paid. 
Is of a dull texture, femi-tranfparent^ 
and full of cracks in the rock. 
a. White, found in Batgrufvan, at Yxfiq 
in Nya Kopparberget in Weftmanland, 
SECT. XCIX, 
2. Sparry Fluor, Fluor Spatofus. 
It has nearly the figure of fpar, though, 
on clofe obfervation, it is found not to be 
fo regular, nothing but the glofiy furfaces 
of this ftone giving it the refemblance of 
